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Method for preparing cellulose base carbon fiber felt through low-temperature alkali urea treatment

A technology of cellulose fiber and carbon-based fiber, which is applied in the direction of artificial filament in cellulose solution, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of environmental pollution, high energy consumption, long process route, etc., and achieve easy recycling , Overcoming the effect of easy gelation and simple process

Inactive Publication Date: 2016-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is that the preparation method of the existing carbon fiber felt has a long process route, high energy consumption, and is easy to cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of low-temperature alkali urea method cellulose-based carbon fiber felt, comprising the steps of:

[0026] Add 0.7g water-soluble carbon black to 930g 3wt%~20wt% sodium hydroxide / 3wt%~15wt% urea / 3wt%~15wt% thiourea aqueous solution while stirring to obtain alkali compound / carbon black aqueous solution; The dry cellulose cotton pulp powder with a degree of polymerization of 600 is dispersed in the above-mentioned alkali compound / carbon black aqueous solution, stirred at high speed to form a suspension, and then enters into the pre-frozen twin-screw, the twin-screw speed is 200rpm, and the temperature of each zone is -4 ℃~2℃; 7wt% uniform and stable cellulose alkali composite / carbon black solution is obtained after low temperature and high shear dissolution in a twin-screw extruder; Silk stock solution: Extrude the spinning stock solution through a 0.01mm spinneret, enter the ethylene glycol / acetic acid aqueous solution at 5°C to solidify and form, an...

Embodiment 2

[0028] A preparation method of low-temperature alkali urea method cellulose-based carbon fiber felt, comprising the steps of:

[0029] Add 100g of water-soluble carbon black to 700g of 3wt%~20wt% sodium hydroxide / 3wt%~15wt% urea / 3wt%~15wt% thiourea aqueous solution while stirring to obtain alkali compound / carbon black aqueous solution; The cellulose cotton pulp powder with a degree of polymerization of 300 is dispersed in the above alkali compound / carbon black aqueous solution, stirred at high speed to form a suspension, and then enters into the pre-frozen twin-screw, the twin-screw speed is 500rpm, and the temperature of each zone is -4°C ~2°C; 20wt% uniform and stable cellulose alkali composite / carbon black solution is obtained after low-temperature and high-shear dissolution in a twin-screw extruder; after filtration and defoaming, the spinning of the precursor fiber of cellulose-based carbon fiber is obtained Stock solution: Extrude the spinning stock solution through a 0....

Embodiment 3

[0031] A preparation method of low-temperature alkali urea method cellulose-based carbon fiber felt, comprising the steps of:

[0032]37.5g of water-soluble carbon black was added to 812.5g of 3wt%~20wt% sodium hydroxide / 3wt%~15wt% urea / 3wt%~15wt% thiourea aqueous solution while stirring to obtain alkali compound / carbon black aqueous solution; 150g The dried cellulose cotton pulp powder with a polymerization degree of 500 is dispersed in the above-mentioned alkali compound / carbon black aqueous solution, stirred at high speed to form a suspension, and enters into the pre-frozen twin-screw, the twin-screw speed is 400rpm, and the temperature of each zone is - 4°C~2°C; 15wt% uniform and stable cellulose alkali composite / carbon black solution is obtained after low-temperature high-shear dissolution in a twin-screw extruder; after filtration and defoaming, the precursor fiber of cellulose-based carbon fiber is obtained Spinning stock solution: Extrude the spinning stock solution th...

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Abstract

The invention discloses a method for preparing cellulose-based carbon fiber felt by low-temperature alkali urea method. The cellulose pulp is stirred at room temperature in a solvent composition of sodium hydroxide, urea, thiourea, water-soluble carbon black and water to prepare the felt. The cellulose suspension is obtained, and then enters the pre-frozen twin-screw extruder to obtain a black cellulose solution, which is finally filtered and defoamed and sprayed into a coagulation bath for spinning, and further washed, drawn, and oiled and drying to obtain cellulose fibers; the cellulose fibers are processed into cellulose fiber mats through a needle-punched non-woven process, and further catalyzed impregnation, pre-oxidation, and carbonization to obtain cellulose-based carbon fiber mats. The process of the invention is simple, the solvent used is green and environmentally friendly, the price is low, and the recovery rate is high. The spun cellulose fiber has a compact structure, good thermal stability, and ablation resistance. The processed cellulose-based carbon fiber felt is better than that without carbon black. Carbon fiber felt has a higher carbon yield.

Description

technical field [0001] The invention discloses a method for preparing a carbon fiber felt, in particular a process for spinning a cellulose-based carbon fiber felt with a cellulose alkali composite / carbon black solution. Background technique [0002] According to the raw materials, carbon fiber felt mainly includes viscose-based carbon fiber felt, polyacrylonitrile-based carbon fiber felt and pitch-based carbon fiber felt. As a high-temperature heat insulation material in aerospace, medical, national defense, steel, chemical and other industries, it has huge applications. potential. Since PAN-based carbon fiber felt has an absolute advantage in terms of comprehensive performance and sales, researchers have conducted a lot of scientific research on PAN used in carbon fiber felt and formed many patents. However, polyacrylonitrile is derived from petroleum or the by-products of petroleum decomposition. Due to the scarcity of petroleum resources, it is very necessary to explore...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/4242D04H1/425D06C7/04D01F9/16D01F2/02D01F1/10
CPCD04H1/4382D01F1/10D01F2/02D01F9/16D04H1/4242D04H1/425D06C7/04
Inventor 余木火杨燕平张玥邓雅
Owner DONGHUA UNIV
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